.xz-lr > span {
  background-color: gray;
  padding: 20px 10px; }



.a{
  width: 30px;
  height: 30px;
  margin: 0 auto;
  margin-top: 40px;
}
.nav{
  height: 150px;
  background-color: whitesmoke;
}
.tp{
  margin-top: 50px;
}
.b{
  width: 100px;
  height: 150px;
}

